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Of all of the revelations about the NSA that have come to light in recent months, two stand out as the most worrisome and surprising to cybersecurity experts. The first is that the NSA has worked to weaken the international cryptographic standards that define how computers secure communications and data. The second is that the NSA has deliberately introduced backdoors into security-critical software and hardware. If the NSA has indeed engaged in such activities, it has risked the computer security of the United States (and the world) as much as any malicious attacks have to date.
No one is surprised that the NSA breaks codes; the agency is famous for its cryptanalytic prowess. And, in general, the race between designers who try to build strong codes and cryptanalysts who try to break them ultimately benefits security. But surreptitiously implanting deliberate weaknesses or actively encouraging the public to use codes that